Wa Alaikum Assalam wa Rahmatullah wa Barakatuh To say someone is like an angel on the outside and a devil on the inside is an English saying - a metaphor. I'm surprised you find it difficult to understand its meaning. It refers to the fact that someone may look good on the outside appareance, but they have a bad soul - their evil is not yet visible as their good manner and youthful beauty cover it up. They are often like an apple that is rotten on the inside but beautiful on the outside - you don't find out what they are like until you actually taste them. Problem is that you both have to go to a mixed sex educational institution and are at an age where you would historically be married but cannot get married due to the constraints of the modern world.